What jobs, you can't say you are one, not after hiring but till you've hit a landmark?

For example, you aren't a Retail Worker 'till you've thought "OH THANK GOD THAT'S KOOL-AID*!!!" or you can't say you're a cowboy 'till you know what Prairie Oysters ARE & eat them Anyway

*Pickle Juice/Beer, brownie batter, Salsa, Mustard, Mayo

What jobs, you can't say you are one, not after hiring but till you've hit a landmark?
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